[PATCH 5.4 495/658] dm integrity: Fix UAF in dm_integrity_dtr()

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From: Luo Meng <luomeng12@xxxxxxxxxx>

commit f50cb2cbabd6c4a60add93d72451728f86e4791c upstream.

Dm_integrity also has the same UAF problem when dm_resume()
and dm_destroy() are concurrent.

Therefore, cancelling timer again in dm_integrity_dtr().

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 7eada909bfd7a ("dm: add integrity target")
Signed-off-by: Luo Meng <luomeng12@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/md/dm-integrity.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -4195,6 +4195,8 @@ static void dm_integrity_dtr(struct dm_t
 	BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
 	BUG_ON(!list_empty(&ic->wait_list));
 
+	if (ic->mode == 'B')
+		cancel_delayed_work_sync(&ic->bitmap_flush_work);
 	if (ic->metadata_wq)
 		destroy_workqueue(ic->metadata_wq);
 	if (ic->wait_wq)





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